The Wolverine Crossbuck boot features Arctic Grip, a groundbreaking technology from Vibram with unparalleled grip and performance on slippery, wet ice. The rubber lug outsole is made from two different compounds for maximum traction on wet and dry ice, and four millimeter lug depth with a wide lug design allows maximum surface contact for performance on varied terrain, while a 90 degree breaking heel aids in steep descents. The Crossbuck also features Wolverine's EPX technology that brings comfort closer to the foot and helps fight fatigue, as well as a reinforced toe and heel for protection and durability. Waterproof Plus breathable membrane combined with 400 grams of Thinsulate Ultra insulation ensures feet stay dry and warm. Material: Leather, Rubber.